This (large -- 50 MB) zip file contains all the stata code and datasets to generate table 2 and
figures 5 and 6.

Of special note, it contains
"sitcreallysmall_allyears.dta". This is a data set
covering US imports from 1974-2004, with detail on exporting country x
SITC revision 2 (5 digit) commodity x transport mode. It contains
shipment values, weight, quantity, tariffs, and transportation charges.

Details on Construction of the dataset

These data come from annual Imports of Merchandise CDs provided by the
Census bureau.Full details on